linux-kernel - Re: [PATCH v2 3/3] IB/core: Obtain subnet

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Message-ID: <1e7ec500-223b-2cf5-9cf4-651e31d7b072@nvidia.com>
Date:   Thu, 3 Jun 2021 20:10:35 +0800
From:   Mark Zhang <markzhang@...dia.com>
To:     Anand Khoje <anand.a.khoje@...cle.com>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <dledford@...hat.com>, <jgg@...pe.ca>, <haakon.bugge@...cle.com>,
        <leon@...nel.org>
Subject: Re: [PATCH v2 3/3] IB/core: Obtain subnet_prefix from cache in IB
 devices

On 6/3/2021 2:50 PM, Anand Khoje wrote:
> External email: Use caution opening links or attachments
> 
> 
> ib_query_port() calls device->ops.query_port() to get the port
> attributes. The method of querying is device driver specific.
> The same function calls device->ops.query_gid() to get the GID and
> extract the subnet_prefix (gid_prefix).
> 
> The GID and subnet_prefix are stored in a cache. But they do not get
> read from the cache if the device is an Infiniband device. The
> following change takes advantage of the cached subnet_prefix.
> Testing with RDBMS has shown a significant improvement in performance
> with this change.
> 
> The function ib_cache_is_initialised() is introduced because
> ib_query_port() gets called early in the stage when the cache is not
> built while reading port immutable property.
> 
> In that case, the default GID still gets read from HCA for IB link-
> layer devices.
> 
> Fixes: fad61ad ("IB/core: Add subnet prefix to port info")
> Signed-off-by: Anand Khoje <anand.a.khoje@...cle.com>
> Signed-off-by: Haakon Bugge <haakon.bugge@...cle.com>
> ---
>   drivers/infiniband/core/cache.c  | 7 ++++++-
>   drivers/infiniband/core/device.c | 9 +++++++++
>   include/rdma/ib_cache.h          | 6 ++++++
>   include/rdma/ib_verbs.h          | 6 ++++++
>   4 files changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
> index b6700ad..724ac0e 100644
> --- a/drivers/infiniband/core/cache.c
> +++ b/drivers/infiniband/core/cache.c
> @@ -1624,6 +1624,8 @@ int ib_cache_setup_one(struct ib_device *device)
>                  err = ib_cache_update(device, p, true);
>                  if (err)
>                          return err;
> +               set_bit(IB_PORT_CACHE_INITIALIZED,
> +                       &device->port_data[p].flags);
>          }
> 
>          return 0;
> @@ -1639,8 +1641,11 @@ void ib_cache_release_one(struct ib_device *device)
>           * all the device's resources when the cache could no
>           * longer be accessed.
>           */
> -       rdma_for_each_port (device, p)
> +       rdma_for_each_port (device, p) {
> +               clear_bit(IB_PORT_CACHE_INITIALIZED,
> +                        &device->port_data[p].flags);
>                  kfree(device->port_data[p].cache.pkey);
> +       }
> 
>          gid_table_release_one(device);
>   }

Do we need to clear it in gid_table_cleanup_one()?